IBM Personal Computer AT Manual To Operations page 268

1
Be sure your system unit's power is off.
2
Turn
all the external devices' (printer, TV, etc.)
power off.
3
Get the Diagnostics diskette located at the back
of this manual.
4
Rotate the diskette drive lever counterclockwise.
5
Insert the Diagnostics diskette into drive A if it is
not inserted yet.
6
Rotate the diskette drive lever clockwise.
Diagnostics Diskette Drive A
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2-24 Setup